/* * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ #include "linux/config.h" #include "linux/posix_types.h" #include "linux/tty.h" #include "linux/tty_flip.h" #include "linux/types.h" #include "linux/major.h" #include "linux/kdev_t.h" #include "linux/console.h" #include "linux/string.h" #include "linux/sched.h" #include "linux/list.h" #include "linux/init.h" #include "linux/interrupt.h" #include "linux/slab.h" #include "linux/hardirq.h" #include "asm/current.h" #include "asm/irq.h" #include "stdio_console.h" #include "line.h" #include "chan_kern.h" #include "user_util.h" #include "kern_util.h" #include "irq_user.h" #include "mconsole_kern.h" #include "init.h" #define MAX_TTYS (16) /* ----------------------------------------------------------------------------- */ /* Referenced only by tty_driver below - presumably it's locked correctly * by the tty driver. */ static struct tty_driver *console_driver; void stdio_announce(char *dev_name, int dev) { printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, dev_name); } static struct chan_opts opts = { .announce = stdio_announce, .xterm_title = "Virtual Console #%d", .raw = 1, .tramp_stack = 0, .in_kernel = 1, }; static int con_config(char *str); static int con_get_config(char *dev, char *str, int size, char **error_out); static int con_remove(int n); static struct line_driver driver = { .name = "UML console", .device_name = "tty", .devfs_name = "vc/", .major = TTY_MAJOR, .minor_start = 0, .type = TTY_DRIVER_TYPE_CONSOLE, .subtype = SYSTEM_TYPE_CONSOLE, .read_irq = CONSOLE_IRQ, .read_irq_name = "console", .write_irq = CONSOLE_WRITE_IRQ, .write_irq_name = "console-write", .symlink_from = "ttys", .symlink_to = "vc", .mc = { .name = "con", .config = con_config, .get_config = con_get_config, .id = line_id, .remove = con_remove, }, }; static struct lines console_lines = LINES_INIT(MAX_TTYS); /* The array is initialized by line_init, which is an initcall. The * individual elements are protected by individual semaphores. */ struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), [ 1 ... MAX_TTYS - 1 ] = LINE_INIT(CONFIG_CON_CHAN, &driver) }; static int con_config(char *str) { return line_config(vts, sizeof(vts)/sizeof(vts[0]), str); } static int con_get_config(char *dev, char *str, int size, char **error_out) { return line_get_config(dev, vts, sizeof(vts)/sizeof(vts[0]), str, size, error_out); } static int con_remove(int n) { return line_remove(vts, sizeof(vts)/sizeof(vts[0]), n); } static int con_open(struct tty_struct *tty, struct file *filp) { return line_open(vts, tty, &opts); } static int con_init_done = 0; static struct tty_operations console_ops = { .open = con_open, .close = line_close, .write = line_write, .put_char = line_put_char, .write_room = line_write_room, .chars_in_buffer = line_chars_in_buffer, .flush_buffer = line_flush_buffer, .flush_chars = line_flush_chars, .set_termios = line_set_termios, .ioctl = line_ioctl, }; static void uml_console_write(struct console *console, const char *string, unsigned len) { struct line *line = &vts[console->index]; unsigned long flags; spin_lock_irqsave(&line->lock, flags); console_write_chan(&line->chan_list, string, len); spin_unlock_irqrestore(&line->lock, flags); } static struct tty_driver *uml_console_device(struct console *c, int *index) { *index = c->index; return console_driver; } static int uml_console_setup(struct console *co, char *options) { struct line *line = &vts[co->index]; return console_open_chan(line, co, &opts); } static struct console stdiocons = { .name = "tty", .write = uml_console_write, .device = uml_console_device, .setup = uml_console_setup, .flags = CON_PRINTBUFFER, .index = -1, .data = &vts, }; int stdio_init(void) { char *new_title; console_driver = line_register_devfs(&console_lines, &driver, &console_ops, vts, ARRAY_SIZE(vts)); if (console_driver == NULL) return -1; printk(KERN_INFO "Initialized stdio console driver\n"); lines_init(vts, sizeof(vts)/sizeof(vts[0])); new_title = add_xterm_umid(opts.xterm_title); if(new_title != NULL) opts.xterm_title = new_title; con_init_done = 1; register_console(&stdiocons); return 0; } late_initcall(stdio_init); static void console_exit(void) { if (!con_init_done) return; close_lines(vts, sizeof(vts)/sizeof(vts[0])); } __uml_exitcall(console_exit); static int console_chan_setup(char *str) { return line_setup(vts, sizeof(vts)/sizeof(vts[0]), str, 1); } __setup("con", console_chan_setup); __channel_help(console_chan_setup, "con");